Torque vector control method for four-wheel drive electric vehicle

Abstract

The invention discloses a torque vector control method for a four-wheel-drive EV electric vehicle. The torque vector control method comprises the following steps of S10, calculating the distribution torque of a front shaft and the distribution torque of a rear shaft; S20, calculating the distribution torque of a left wheel and the distribution torque of a right wheel; S30, calculating the steering power-assisted distribution torque of the left wheel and the steering power-assisted distribution torque of the right wheel; and S40, according to the distribution torque of the left wheel and the distribution torque of the right wheel, obtained through calculation in the step S20, as well as the steering power-assisted distribution torque of the left wheel and the steering power-assisted distribution torque of the right wheel, obtained through calculation in the step S30, calculating the output torque of each wheel, and performing largest torque limit. According to the torque vector control method disclosed by the invention, through torque distribution between shafts, favorable road surface adhesive force is obtained, and the power performance of the vehicle is improved; at low-speed travelling, different torque of a left driving wheel and a right driving wheel is controlled, and the turning radius under the situation of low-speed travelling such as parking and stall parking is reduced; and at high-speed travelling, the torque of the left driving wheel and the torque of the right driving wheel are coordinated and controlled through cooperating with the travelling state of the vehicle, so that the steering performance is improved, and besides, better drive stability during high-speed travelling can be obtained.

Description

technical field [0001] The invention belongs to the technical field of four-wheel drive torque distribution of pure electric vehicles, and in particular relates to a torque vector control method for four-wheel drive EV electric vehicles. Background technique [0002] Four-wheel drive pure electric vehicles can adjust the torque of four wheels independently, and the motor drive has the characteristics of fast torque response and continuous torque adjustment, so the torque vector control of four-wheel drive pure electric vehicles is more suitable for steering through torque distribution. Accessibility and stability control. [0003] At present, the research on four-wheel drive of pure electric vehicles is mainly oriented to the distribution of driving torque and braking torque. In terms of braking force, the importance is mainly explained through the aspect of vehicle stability. For the aspect of driving torque distribution, it is explained through the aspects of improvement ...

AI Technical Summary

Problems solved by technology

[0009] To sum up, although there are already some patents on the four-wheel drive torque control of pure electric cars, due to the particularity of the drive system, there is still a lot of room for excavation in the drive torque distribution.

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